Up for pee, down for poop. Simple! Spotted in a highway rest stop, kudos to the anonymous, water-aware doo-gooder that added the simplified Sharpie version to the dual flush toilet instructions provided.
Note to technical types: if your toilet how-to needs a schematic drawing, the instructions likely need editing!
Note to everyone else: An easy mnemonic for these devices: remember to PUSH for number 2! And the handle as well!